2 * Copyright (c) 2015, Linaro Limited, Shannon Zhao
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * You should have received a copy of the GNU General Public License
14 * along with this program. If not, see <http://www.gnu.org/licenses/>.
17 #include <linux/platform_device.h>
18 #include <linux/acpi.h>
21 #include <xen/interface/memory.h>
22 #include <asm/xen/hypervisor.h>
23 #include <asm/xen/hypercall.h>
25 static int xen_unmap_device_mmio(const struct resource *resources,
28 unsigned int i, j, nr;
30 const struct resource *r;
31 struct xen_remove_from_physmap xrp;
33 for (i = 0; i < count; i++) {
35 nr = DIV_ROUND_UP(resource_size(r), XEN_PAGE_SIZE);
36 if ((resource_type(r) != IORESOURCE_MEM) || (nr == 0))
39 for (j = 0; j < nr; j++) {
40 xrp.domid = DOMID_SELF;
41 xrp.gpfn = XEN_PFN_DOWN(r->start) + j;
42 rc = HYPERVISOR_memory_op(XENMEM_remove_from_physmap,
52 static int xen_map_device_mmio(const struct resource *resources,
55 unsigned int i, j, nr;
57 const struct resource *r;
61 struct xen_add_to_physmap_range xatp;
63 for (i = 0; i < count; i++) {
65 nr = DIV_ROUND_UP(resource_size(r), XEN_PAGE_SIZE);
66 if ((resource_type(r) != IORESOURCE_MEM) || (nr == 0))
69 gpfns = kzalloc(sizeof(xen_pfn_t) * nr, GFP_KERNEL);
70 idxs = kzalloc(sizeof(xen_ulong_t) * nr, GFP_KERNEL);
71 errs = kzalloc(sizeof(int) * nr, GFP_KERNEL);
72 if (!gpfns || !idxs || !errs) {
80 for (j = 0; j < nr; j++) {
82 * The regions are always mapped 1:1 to DOM0 and this is
83 * fine because the memory map for DOM0 is the same as
84 * the host (except for the RAM).
86 gpfns[j] = XEN_PFN_DOWN(r->start) + j;
87 idxs[j] = XEN_PFN_DOWN(r->start) + j;
90 xatp.domid = DOMID_SELF;
92 xatp.space = XENMAPSPACE_dev_mmio;
94 set_xen_guest_handle(xatp.gpfns, gpfns);
95 set_xen_guest_handle(xatp.idxs, idxs);
96 set_xen_guest_handle(xatp.errs, errs);
98 rc = HYPERVISOR_memory_op(XENMEM_add_to_physmap_range, &xatp);
109 xen_unmap_device_mmio(resources, i);
113 static int xen_platform_notifier(struct notifier_block *nb,
114 unsigned long action, void *data)
116 struct platform_device *pdev = to_platform_device(data);
119 if (pdev->num_resources == 0 || pdev->resource == NULL)
123 case BUS_NOTIFY_ADD_DEVICE:
124 r = xen_map_device_mmio(pdev->resource, pdev->num_resources);
126 case BUS_NOTIFY_DEL_DEVICE:
127 r = xen_unmap_device_mmio(pdev->resource, pdev->num_resources);
133 dev_err(&pdev->dev, "Platform: Failed to %s device %s MMIO!\n",
134 action == BUS_NOTIFY_ADD_DEVICE ? "map" :
135 (action == BUS_NOTIFY_DEL_DEVICE ? "unmap" : "?"),
141 static struct notifier_block platform_device_nb = {
142 .notifier_call = xen_platform_notifier,
145 static int __init register_xen_platform_notifier(void)
147 if (!xen_initial_domain() || acpi_disabled)
150 return bus_register_notifier(&platform_bus_type, &platform_device_nb);
153 arch_initcall(register_xen_platform_notifier);
155 #ifdef CONFIG_ARM_AMBA
156 #include <linux/amba/bus.h>
158 static int xen_amba_notifier(struct notifier_block *nb,
159 unsigned long action, void *data)
161 struct amba_device *adev = to_amba_device(data);
165 case BUS_NOTIFY_ADD_DEVICE:
166 r = xen_map_device_mmio(&adev->res, 1);
168 case BUS_NOTIFY_DEL_DEVICE:
169 r = xen_unmap_device_mmio(&adev->res, 1);
175 dev_err(&adev->dev, "AMBA: Failed to %s device %s MMIO!\n",
176 action == BUS_NOTIFY_ADD_DEVICE ? "map" :
177 (action == BUS_NOTIFY_DEL_DEVICE ? "unmap" : "?"),
178 adev->dev.init_name);
183 static struct notifier_block amba_device_nb = {
184 .notifier_call = xen_amba_notifier,
187 static int __init register_xen_amba_notifier(void)
189 if (!xen_initial_domain() || acpi_disabled)
192 return bus_register_notifier(&amba_bustype, &amba_device_nb);
195 arch_initcall(register_xen_amba_notifier);